JP3632553B2 - Noble gas fluorescent lamp - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an improvement in a rare gas fluorescent lamp used for illuminating a document in an information device such as a facsimile, a copying machine, an image reader, or a backlight of a liquid crystal panel display.
[0002]
[Prior art]
In an image reading apparatus such as a copying machine or an image reader, generally, a substantially cylindrical lamp is arranged in the width direction of a document, light emitted from the lamp is irradiated on the document, and the light reflected by the document or the document The light transmitted through is read by a CCD image sensor or the like. There are various types of lamps for image reading, but external electrode type rare gas fluorescent lamps are widely used.
[0003]
Japanese Patent Laid-Open No. 04-087249 discloses a technical idea of covering a rare gas fluorescent lamp having a pair of external electrodes 43 and 43 'on the outer surface of a glass bulb as shown in FIG. Yes. In general, a lamp in which a pair of electrodes is provided on the outer surface of a glass bulb, including the lamp described in Japanese Patent Application Laid-Open No. 04-087249, has a high voltage applied to the external electrodes 43 and 43 ′ via the glass bulb 20 as a dielectric. So-called silent discharge or dielectric barrier discharge is used.
Therefore, in practical use, it is necessary to insulate the electrodes in order to avoid an abnormal operation that occurs when the external electrodes 43, 43 'are in contact with other metal parts, or for safety reasons. The technique of Japanese Patent Laid-Open No. 04-087249 is provided with a pair of strip electrodes over almost the entire length of the glass bulb, and an insulating coating such as silicon resin is deposited on the glass bulb including the strip electrodes, This object is achieved by coating the heat-shrinkable tube on the insulating coating.
[0004]
On the other hand, FIG. 2 of Japanese Patent Laid-Open No. 03-84550 discloses a structure in which electrodes are provided on the inner and outer surfaces of a bulb.
With this electrode configuration, if a high voltage is applied to the inner surface electrode, there is no need to provide an insulating coating on the glass bulb.
[0005]
By the way, in a rare gas fluorescent lamp having a pair of electrodes on the outer surface of the glass bulb and a rare gas fluorescent lamp having electrodes on the inner surface and the outer surface of the glass bulb, the amount of light emitted from the aperture immediately after lighting There was a problem that attenuated.
This phenomenon is particularly prominent at the center of the lamp. Attenuation of the amount of light is also observed at both ends of the lamp, and improvement of the light source for document illumination has been desired. This phenomenon is caused by a decrease in the efficiency of converting ultraviolet light emitted from the discharge plasma into visible light because the temperature of the phosphor disposed inside the lamp rises due to heat generated by lighting. It is explained that the heat generation at is larger than both ends of the lamp.
[0006]
Next, Japanese Patent Application Laid-Open No. 9-185554 proposes a technical idea that solves the above problems by providing a heat storage member on the outer peripheral surface of the lamp. In paragraphs [0043] and [0044] of Japanese Patent Application Laid-Open No. 9-185594, “the heat storage means (or heat storage member) is provided around the lamp” means that the heat storage means is provided on the outer peripheral surface or the inner peripheral surface of the lamp. In this case, it means that the heat storage means is placed near the lamp with some members interposed, and the heat storage means takes the heat of the lamp and removes the heat. It is a substance that has the property that it can accumulate in itself. In other words, it is a substance that can reduce the rate of temperature rise of the lamp immediately after lighting and can increase the time required to cool the lamp by heat dissipation.
[0007]
Here, when reading a document or image information with a relatively limited amount of information, the information can be read in a short time, and by providing a heat storage member on the outer peripheral surface of the lamp, the rate of temperature rise of the lamp is reduced. Since the temperature rise rate of the phosphor can be suppressed, the light quantity attenuation of the lamp can be suppressed from the start of reading information to the end of reading, and information can be read satisfactorily, which is disclosed in JP-A-9-185554. The effect of the technical idea is recognized.
[0008]
However, when color image information having a large amount of information is read with a CCD image sensor at a high resolution of the three primary colors, it may take a long time from 30 minutes to over 1 hour to read all the image information.
In this case, since the heat generated by the lamp is taken away by the heat storage member, the heat generation of the lamp can be suppressed until a certain time, and therefore the attenuation of the light amount can be suppressed. However, when a long time exceeding 30 minutes to 1 hour is required, the heat storage member comes into thermal saturation due to heat generated from the lamp, the function of taking heat away from the lamp is lowered, and the temperature of the lamp rises. The amount of light is attenuated. That is, since the amount of light is significantly attenuated at the start and end of reading of image information, a means for performing a certain correction on the read information may be required. This problem is particularly noticeable when image information is read over a long period of time immediately after being turned on by a lamp that has been turned off for a long time. Furthermore, since the heat storage member itself is made of rubber and a metal member, the cost of the lamp is increased. In applications such as a copying machine that scans the lamp unit at high speed, the weight of the lamp unit increases, and it is necessary to select a drive motor with a large torque, which increases costs.
[0009]
Therefore, in the technical idea of Japanese Patent Laid-Open No. 9-185594, even if the time until the lamp temperature reaches saturation can be reduced by the heat storage means or the heat storage member, it is not necessarily the technical idea to lower the lamp saturation temperature.
[0010]
[Problems to be solved by the invention]
The present invention has been made in view of the above problems, and its object is to provide a rare gas fluorescent lamp in which at least one electrode is provided on the inner surface of a glass bulb and the high voltage side is connected to the electrode. By lowering the lamp saturation temperature at the time of stable lighting for a long time, attenuation of the amount of light emitted from the aperture is reduced even after lighting over the entire length of the lamp, thereby providing a light source for illuminating a manuscript that is lightweight and inexpensive.
[0011]
[Means for Solving the Problems]
In order to solve this problem, the invention according to claim 1 is arranged such that at least one of the electrodes is disposed as an internal electrode on the inner surface of the glass bulb, the high voltage side of the power source is connected to the internal electrode, An electrode is disposed on the inner or outer surface of the glass bulb, a phosphor layer is disposed so as to cover the inner electrode, a light extraction aperture is provided in the phosphor layer, and a rare gas is disposed in the glass bulb. In a rare gas fluorescent lamp using a dielectric barrier discharge.In the center ofThe injection rate is larger than the injection rate of the glass bulbpluralThermal radiation materialThe glass bulb partiallyThis is because the rare gas fluorescent lamp is characterized by being covered.Here, the plurality of heat radiation materials may be the same type or different types.
[0012]
Here, the injection rate is defined by, for example, literature (Introduction to Heat Transfer, Yoshiro Kato, P.339, Showa 49 Yokendo). In this document, thermal radiation of a general object is different from blackbody radiation in both energy distribution and size according to wavelength. However, the black body radiation at the same temperature as the object is taken as a standard, and the emission ratio is described as a ratio to that, and it is stated that it is related to the surface temperature, material, and property of the object. Yes.
[0015]
Claim2The invention according to claim 2, wherein the heat radiation material is a polymer material.1This is because the rare gas fluorescent lamp is described.
[0016]
[Action]
Next, the operation of the technical idea of the present invention will be described.The SaidBy covering the glass bulb with a heat radiation material having an injection rate larger than that of the glass bulb, particularly when cooling under conditions that can be regarded as natural convection or substantially natural convection, the heat transfer coefficient of the lamp surface increases. As a result, the lamp surface temperature during lighting is lowered. Furthermore, the surface area of the lamp is increased by the amount of the heat radiation material than the surface area of the glass bulb alone, and the lamp surface temperature during lighting is lowered. By superimposing the heat radiation material, the heat transfer coefficient or the surface area of the lamp is further increased. As a result, the temperature of the phosphor at the time of lighting is lowered, and the absolute amount of attenuation of light quantity after starting lighting can be suppressed.In particular, the glass bulb is partially covered by overlapping a plurality of the heat radiating materials on the central portion of the glass bulb, in particular, the temperature of the phosphor in the central portion of the lamp is further lowered, and is almost the same as the phosphors on both ends of the lamp. The temperature is reduced to a certain level, and the light amount attenuation is suppressed over the entire length of the lamp, and the light amount is attenuated substantially uniformly in the lamp axis direction.
[0018]
Claim2In this invention, since the heat radiation material is a polymer material, a light-transmitting heat radiation material having an emission rate larger than that of the glass bulb can be applied.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Next, an embodiment of the present invention will be described.Figure 1 shows noble gas1 is a cross-sectional view of a fluorescent lamp 10. FIG. Reference numeral 20 denotes a glass bulb. A pair of internal electrodes 41 and 42 are disposed on the inner surface, and a phosphor layer 60 is provided so as to cover the internal electrodes. For the purpose of increasing the amount of light emitted from the aperture 70 described later, one or more reflective material layers may be appropriately placed under the phosphor layer 60. Various materials can be applied to the reflective material layer, and a material having a high reflectance in the visible region is particularly suitable.
[0020]
A high voltage is applied between the pair of internal electrodes, the phosphor layer 60 functions as a dielectric, a predetermined discharge is generated in the discharge space 50, ultraviolet or vacuum ultraviolet light is emitted from the discharge plasma, and the phosphor layer 60 is irradiated, converted into visible light, and emitted from the aperture 70. The outer surface of the glass bulb 20 is further covered with a heat radiation material 30 having an emission rate higher than that of the glass bulb 20, but at least the heat radiation material 30 is preferably transparent in the aperture 70 region. Further, there is no high voltage electrode on the outer surface of the glass bulb 20, and the heat radiation material 30 functions effectively in order to reduce the heat generation of the lamp.
[0021]
Next, FIG.Then43 is an external electrode provided on the outer surface of the glass bulb 20. An internal electrode 40 is provided on the inner surface of the glass bulb 20. The internal electrode 40 is further covered with a phosphor layer 60. The outer surface of the glass bulb 20 is covered with the heat radiation material 31 and the heat radiation material 32 including the external electrode 43. A high voltage is applied between the internal electrode 40 and the external electrode 43, the phosphor layer 60 and the glass bulb 20 function as a dielectric, a predetermined discharge is generated in the discharge space 50, and ultraviolet or vacuum ultraviolet light is discharged into the discharge plasma. Is emitted to the phosphor layer 60, converted into visible light, and emitted from the aperture 70.
[0022]
Since the external electrode 43 is normally grounded or is applied with a voltage that does not cause a safety problem, it does not require any measures for insulation. In the present invention, the outer surface of the glass bulb 20 is further covered with a heat radiation material 31 that is equal to or higher than the injection rate of the glass bulb 20 and further covered with a heat radiation material 32. Here, the injection rate of the heat radiation material 32 is preferably higher than at least the injection rate of the glass bulb 20. It is preferable that the emission rate of the heat radiation material 32 is higher than the emission rate of the heat radiation material 31 in terms of lowering the temperature of the phosphor layer 60 at the time of lighting, but this is not necessarily limited as long as a predetermined temperature reduction is achieved. Absent. Further, it is desirable that the heat radiation material 31 and the heat radiation material 32 have translucency in the aperture 70 region.
[0023]
Next, FIG.In invention of Claim 1Such an embodiment is shown. Reference numeral 10 denotes a rare gas fluorescent lamp according to the present invention, in which an internal electrode is disposed on the inner surface of the glass bulb and an external electrode is disposed on the outer surface of the glass bulb. The closing body 80 leads the internal electrode to the outside of the glass bulb and performs airtight sealing. The power supply terminal 100 is a terminal for supplying a high voltage from the lighting power supply 110 to the internal electrode and the external electrode. The high voltage side is connected to the internal electrode.
[0024]
Next, the high voltage power source applied to the internal electrode and the external electrode of the lamp of the present invention and the voltage waveform will be described. The present inventors have proposed a pulse lighting drive by a flyback method in Japanese Patent Application Laid-Open No. 9-199285 as a method of driving this kind of lamp with high efficiency. FIG. 10A shows an example of the circuit configuration. T1 is a transformer, Q1 is a switching element, and PC is a pulse control system. The impedance Z is appropriately formed from a resistance, a coil, and a capacitor from infinity (that is, floating) to zero (ground).
[0025]
Q1 is turned on and off by a signal from the pulse control system PC, and a high voltage pulse is generated on the secondary side of the transformer T1. The secondary high voltage side HV of the transformer T1 can be selected in polarity according to the winding specifications of the transformer and is connected to the internal electrode. FIG. 11A is an example of a lighting waveform when the polarity is negative. The other low-voltage side G is connected to the internal electrode or the external electrode of the lamp of the present invention and grounded through the impedance Z. Here, in the present invention, the impedance Z is selected to be ground or a value that can be regarded as ground.
[0026]
As an example of a similar lighting circuit, FIG. 10B shows a self-excited sine wave lighting circuit that has been widely used conventionally. R1 and R2 are resistors, Q2 and Q3 are switching elements, C is a capacitor, T2 is a transformer, and Z is the same as described above. Unlike the previous flyback method, this method does not require a pulse control system for turning on and off the switching elements Q2 and Q3, and can realize an inexpensive circuit. A sine wave high voltage is generated on the secondary side of the transformer T2. The secondary high voltage side HV of the transformer T2 is connected to the internal electrode. FIG.11 (b) is an example of the lighting waveform of self-excited sine wave lighting. The other low-voltage side G is connected to the internal electrode or the external electrode of the lamp of the present invention and grounded through the impedance Z. Here, in the present invention, the impedance Z is selected to be ground or a value that can be regarded as ground.
[0027]
In FIG. 3, the rare gas fluorescent lamp is configured to be covered with the heat radiation material 31 over the substantially entire length in the axial direction, and further cover the substantially central portion of the lamp with the heat radiation material 32. In some cases, both ends of the lamp are further provided with terminals for connecting a holder, a harness for supplying a high voltage, and the like. When this lamp is lit, a uniform discharge is obtained in the axial direction of the lamp, but the temperature rise of the lamp is different at both ends and the center of the lamp. The reason for this is considered to be that the lamp end portion is more easily deprived of heat than the center portion. Since the temperature of the phosphor arranged on the glass bulb inner surface of the lamp is likely to rise from the lamp end to the center, the conversion efficiency of the phosphor from UV light to visible light decreases as the temperature rises. Therefore, the decrease in the amount of light emitted from the aperture immediately after lighting is greater at the center than at the lamp end.
[0028]
FIG. 4 is an example showing the lighting time and the state of illuminance attenuation when the lamp according to FIG. 3 of the present invention is not covered with the heat radiating material at the lamp end and the center. The horizontal axis is lighting time, and the vertical axis is relative illuminance. When the illuminance immediately after lighting is 100%, the illuminance attenuation rate at the center is larger than that at the lamp end.
[0029]
Therefore, the rare gas fluorescent lamp of the present invention is covered with a heat radiation material having an injection rate higher than that of the glass bulb over almost the entire length in the axial direction. By doing so, as shown in FIG. 5, the illuminance attenuation rate at the center of the lamp is suppressed as compared with the case of FIG. Furthermore, by covering the central part of the lamp with a heat radiation material, the illuminance attenuation rate at the center of the lamp can be further suppressed, approaching the illuminance attenuation at the end of the lamp, and the illuminance attenuation rate can be suppressed over the entire lamp Illuminance is attenuated uniformly.
[0030]
【Example】
<Measurement of injection rate>
In the measurement of the injection rate, as already described in the literature, the injection rate depends on the surface state, so carbon rods (injection rate ε = 0.98) and black bodies are known materials of two types of injection rates. A spray (ε = 0.97, manufactured by HORIBA, Ltd.) was prepared. Next, set the carbon rod and the object to be measured in a furnace capable of soaking at about ± 1 ° C in the furnace, and apply the previous black body spray locally to a part of the object to be measured. After heating to a predetermined temperature and after a sufficient time, a radiation thermometer (Keyence, IT2-202,
IT2-50) measures the temperature of the carbon rod, and further measures the temperature of the object to be measured where the black body spray is applied. Finally, the object to be measured is the temperature of the carbon rod and the part where the black body spray is applied. The injection rate of the object to be measured was obtained by changing the injection rate of the radiation thermometer so that the temperature indicated value was the same as the temperature of the target. When the indicated value of the temperature of the carbon rod and the temperature of the black body spray application part differed, the average value was used.
[0031]
<Measurement of lamp temperature>
The temperature of the lamp is measured by, for example, dividing the radial direction of the glass bulb into four equal parts in the center of the lamp, and measuring the four lamp surface temperatures by correcting the injection rate according to the material with the previous radiation thermometer. The average value was taken as the lamp temperature at that position. This measurement was performed at three locations at the center of the lamp and 160 mm from the center of the lamp.
[0032]
<Evaluation of lamp input>
In the lamp input, 10% of the electrical energy input to the lamp according to the present invention is Joule heat of discharge, 10% is output by visible light or radiation, and 30% is taken outside as conduction and convection loss. It is important to estimate what will happen. That is, unless the lamp input is accurately measured, it is not easy to confirm the effect of the present invention from the measured value of the lamp temperature under each condition. Therefore, in the present invention, the measurement of the lamp input is performed as strictly as possible. In a lamp using silent discharge or dielectric barrier discharge that discharges through a dielectric according to the present invention, the lamp input power is generally obtained by the VQ Lissajous method. ing.
[0033]
An outline of this method is shown in FIG. T1 is a transformer and C1 is an integrating capacitor having a capacitance Cm. For example, a Lissajous figure as shown in FIG. 7 is obtained from the accumulated voltage Q (Q = Cm × Vq) of C1 obtained from the voltage VL across the lamp and the voltage Vq across C1. The area S of the Lissajous figure (shaded portion in the figure) corresponds to the lamp input per cycle of the lamp voltage waveform. When the lamp operating frequency is f, the lamp input P can be calculated by P = S × f. The size of C1 is set so as to be about VL: Vq = 1000: 1, and consideration is given so that the lamp voltage waveform is not greatly affected. The lamp input P includes energy consumption due to the dielectric loss of the lamp, but the ratio of the lamp input P is small and does not cause a problem in explaining the effect of the present invention.
[0034]
<Example 1>
Next, specific examples of the present invention will be described. As a comparative example, in FIG. 1, a lamp not coated with the heat radiation material 30 was produced.
As the glass bulb 20, lead-free glass (trade name: PS-94, Nippon Electric Glass) having an outer diameter of φ8.0 and a thickness of 0.55 was used. The lead-free glass injection rate was ε = 0.90 according to previous measurements. For the internal electrodes 41 and 42, a commercially available silver paste was applied to the inner surface of the glass bulb 20 using a dispenser. The silver paste is obtained by kneading an organic binder and a solvent as appropriate with silver powder. Further, after the internal electrodes 41 and 42 were baked, the phosphor slurry was applied by, for example, a suction method and disposed so as to cover the internal electrodes 41 and 42. In this example, the coating thickness of the phosphor layer 60 was set to 40 μm to 90 μm.
[0035]
As the phosphor, LaPO4: Ce, Tb was used, but other rare earth phosphors can also be applied. The aperture 70 was provided by mechanically removing a part of the phosphor layer 60. Xenon 13.3 kPa was sealed inside the lamp.
[0036]
The total length of the lamp is about 360 mm. When this lamp was lit by pulse lighting by the flyback method proposed by the present inventors in Japanese Patent Laid-Open No. 9-199285, typical results shown in FIG. 4 were obtained. Assuming that the illuminance immediately after lighting is 100%, the lamp central illuminance was attenuated by about 8% and the lamp end was attenuated by about 4% within 5 minutes after lighting. After 30 minutes, the illuminance at the center of the lamp was attenuated by about 10%, and the end of the lamp was attenuated by about 5%.
[0037]
Next, the lamp of Example 1 of the present invention was completed by covering this lamp with PET (trade name: Teletube Teijin Kasei, thickness after shrinkage of about 150 μm) as the heat radiation material 31 over the entire length of the lamp. The injection rate of this PET heat shrinkable tube was ε = 0.94 according to the previous measurement. When this lamp was lit by pulse lighting by the flyback method proposed by the present inventors in JP-A-9-199285, typical results shown in FIG. 5 were obtained. Assuming that the illuminance immediately after lighting is 100%, the lamp central illuminance was suppressed to about 5% attenuation within 5 minutes after lighting, and the lamp end portion was attenuated by about 3%. After 30 minutes, the illumination intensity at the center of the lamp was only about 6% and only about 3% at the end of the lamp.
[0038]
<Example 2>
Next, a Teflon-based heat-shrinkable tube (trade name K2, polyvinylidene fluoride, Sumitomo Electric, thickness after shrinkage of about 200 μm) is applied as the heat radiation material 31 over the entire length of the lamp of the present invention in Example 1. The lamp was completed. The injection rate of this Teflon heat shrinkable tube was ε = 0.97 according to the previous measurement. When this lamp was turned on by pulse lighting by the same flyback method as described above, the typical result shown in FIG. 5 was obtained. Assuming that the illuminance immediately after lighting is 100%, the lamp central illuminance was suppressed to about 4% attenuation for 5 minutes after lighting, and the lamp end portion was attenuated by about 2%. After 30 minutes, the illumination at the center of the lamp was about 4% and the end of the lamp was only about 2% attenuation. The lamp was lit for another 30 minutes, but no further attenuation of illuminance was seen.
[0039]
<Example 3>
Next, the Teflon heat shrinkable tube was removed as the heat radiation material 31 covered in the whole in Example 2 except for the central part 120 mm of the lamp. This lamp was turned on by pulse lighting by the same flyback method as before. In this example, when the illuminance immediately after lighting was set to 100%, the lamp central illuminance was suppressed to about 4% attenuation for 5 minutes after lighting, and the lamp end portion was attenuated to about 3%. After 30 minutes, the illumination at the center of the lamp was about 4% and the end of the lamp was only about 3% attenuation. The lamp was lit for an additional 30 minutes, but no more illuminance decay was seen.
[0040]
<Example 4>
Next, the black body spray used for the measurement of the injection rate was applied as the heat radiation material 31 to the 120 mm region of the central portion of the lamp of the present invention in Example 1 except for the aperture portion.
The injection rate of the coating film by black body spray is ε = 0.97, and the coating thickness is about 3 μm. This lamp was turned on by pulse lighting by the same flyback method as before. In this example, when the illuminance immediately after lighting was set to 100%, the lamp central illuminance was suppressed to about 4% attenuation for 5 minutes after lighting, and the lamp end portion was attenuated to about 3%. After 30 minutes, the illumination intensity at the center of the lamp was about 5% and the end of the lamp was only about 3% attenuation. The lamp was lit for another 30 minutes, but the illumination at the center of the lamp was attenuated by about 6% and the end of the lamp was attenuated by about 4%.
[0041]
Table 1 shown in FIG. 8 is an example showing a measurement example of the lamp surface temperature together with the lamp input in this example. As can be seen from Table 1, it was confirmed that the surface temperature of the lamp was lowered by about 7 to 8 deg by covering with a polymer material having a large injection rate as the heat radiation material. This is because the higher the emission rate of the lamp surface, the easier the heat energy inside the lamp is released to the outside of the lamp due to radiation, and the higher the surface area is increased by covering the polymer material. is there. For example,
When the thickness increases by 200 μm with respect to the glass bulb diameter φ8, the surface area increases by about 5%, which is an effective numerical value for explaining the effect of the present invention.
[0042]
As described above, specific examples of the embodiment of the present invention have been described. The present invention is not limited to these examples. The effects of the present invention are also recognized in each combination of the embodiments described herein.
In particular, lead-free products are used for various materials, but this is in consideration of environmental impact. Therefore, basically, lead glass, borosilicate glass, soda lime glass, aluminosilicate glass and the like can be applied as the glass bulb. As the internal electrode, in addition to the silver paste, a paste of carbon paste, silver-palladium, gold, gold-palladium, platinum, platinum-palladium, or the like can be used, and ITO or a nesa film can be used.
[0043]
In addition, examples of the polymer material as the heat radiation material include PET and a Teflon heat shrinkable tube in the embodiment, but other than this, a polymer material having a heat shrink function or a liquid resin is dipped and dried. Even if the material is provided, the effect of the present invention is recognized as long as the injection rate is higher than the injection rate of the glass bulb to be applied.
[0044]
【The invention's effect】
Next, the effect of the present invention will be described. At least one electrode is disposed on the inner surface of the glass bulb as an internal electrode, the other electrode is disposed on the inner surface or the outer surface of the glass bulb, the high-voltage side of the power source is connected to the internal electrode, and the internal In the rare gas fluorescent lamp in which the phosphor layer is disposed so as to cover the electrode, and a light extraction aperture is provided in the phosphor layer, a rare gas is enclosed in the glass bulb, and a dielectric barrier discharge is used. By covering the glass bulb with a light and inexpensive heat radiation material with an emission rate larger than that of the glass bulb, more heat energy inside the lamp can be radiated and the temperature of the lamp can be lowered. Even when the lamp is lit, stable illuminance can be obtained over the entire length of the lamp without any significant attenuation compared to the illuminance at the beginning of lighting. It can provide a suitable lamp.
[Brief description of the drawings]
FIG. 1 is a diagram showing an example of an embodiment of the present invention.
FIG. 2 is a diagram showing an example of an embodiment of the present invention.
FIG. 3 is a diagram showing an example of an embodiment of the present invention.
FIG. 4 is an example of measurement data according to the prior art according to the present invention.
FIG. 5 is an example of measurement data according to the present invention.
FIG. 6 is a measurement system for measuring the lamp input of a lamp according to the present invention.
FIG. 7 is an example of a Lissajous figure of a lamp according to the present invention.
FIG. 8 is a table summarizing the effects of the present invention.
FIG. 9 is a cross-sectional view of an external electrode type fluorescent lamp as an example of the prior art.
FIG. 10 is an example of a circuit for lighting a lamp of the present invention.
FIG. 11 is an example of a lighting waveform for lighting the lamp of the present invention.
[Explanation of symbols]
10 Noble gas fluorescent lamp
20 Glass bulb
30 Thermal radiation material
31 Thermal radiation material
32 Thermal radiation material
40 Internal electrode
41 Internal electrode
42 Internal electrode
43 External electrode
43 'external electrode
60 phosphor layers
70 aperture
80 Occlusion body
90 Exhaust pipe remainder
100 Feeding terminal
110 Lighting power supply

Claims (2)

At least one electrode is disposed as an internal electrode on the inner surface of the glass bulb, the high voltage side of the power source is connected to the internal electrode, and the other electrode is disposed on the inner surface or the outer surface of the glass bulb, In a rare gas fluorescent lamp that disposes a phosphor layer so as to cover the internal electrode and provides a light extraction aperture in the phosphor layer, encloses a rare gas in the glass bulb, and uses a dielectric barrier discharge.
A rare gas fluorescent lamp , wherein a plurality of heat radiation materials having an emission rate larger than that of the glass bulb are overlapped on a central portion of the glass bulb to partially cover the glass bulb . The rare gas fluorescent lamp according to claim 1, wherein the heat radiation material is a polymer material.

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